EP 1675267 B1 20081210 - Periodic electrical signal frequency monitoring systems and methods
Title (en)
Periodic electrical signal frequency monitoring systems and methods
Title (de)
Vorrichtung und Verfahren zur Überwachung der Frequenz eines periodischen Signals
Title (fr)
Dispositif et porcédé de surveillance de la fréquence d'un signal périodique
Publication
Application
Priority
US 2433204 A 20041222
Abstract (en)
[origin: EP1675267A1] Systems and methods for monitoring frequencies of periodic electrical signals are disclosed. According to one technique, a first and second counters are respectively clocked by a first periodic electrical signal to be monitored and a second periodic electrical, and a threshold detector resets one of the counters when a count of the other counter crosses a reset threshold and determines whether a frequency error has occurred based on whether a count of the one of the counters crosses an alarm threshold. Another technique according to an embodiment of the invention also involves clocking counters with respective periodic electrical signals, although error detection is based on whether the counts of the counters cross respective associated thresholds in other than a particular sequence with respect to each other.
IPC 8 full level
H03L 7/095 (2006.01); G01R 23/00 (2006.01)
CPC (source: EP US)
G01R 23/005 (2013.01 - EP US); G01R 23/10 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1675267 A1 20060628; EP 1675267 B1 20081210; AT E417407 T1 20081215; CN 1793988 A 20060628; CN 1793988 B 20100804; DE 602005011564 D1 20090122; US 2006132190 A1 20060622; US 7154305 B2 20061226
DOCDB simple family (application)
EP 05301075 A 20051219; AT 05301075 T 20051219; CN 200510131873 A 20051215; DE 602005011564 T 20051219; US 2433204 A 20041222